Are A4 B7 seats the same shape/design as A3 8P

[mattandrew]

My brother is about to join the Audi club and is about to purchase a 2006 B7 A4 Cabriolet which does not have heated seats. A mate of ours has a 2007 8P A3 3door which has heated seats which are not wired up as he retrofitted them so I was wondering about a swap (obviously the wiring and climate would need sorting, but it would save stripping the seats and installing heater elements).

It would only be a front seat swap, but i was unsure if the design of the bolsters, seat size etc is the same

Thanks in advance